CN1379186A - Hydraulic system with current-constant network and secondary regulation - Google Patents
Hydraulic system with current-constant network and secondary regulation Download PDFInfo
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- CN1379186A CN1379186A CN 02111753 CN02111753A CN1379186A CN 1379186 A CN1379186 A CN 1379186A CN 02111753 CN02111753 CN 02111753 CN 02111753 A CN02111753 A CN 02111753A CN 1379186 A CN1379186 A CN 1379186A
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- hydraulic pump
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Abstract
A hydraulic system with secondary regulation for constant-current network features that the oil-sucking ports and oil-discharging ports of multiple variable motors with by-pass functions are sequentially and serially connected, the oil-sucking port of the first variable motor is connected with the outlet of quantitative hydraulic pump, and the oil-discharging port of the last variable motor is connected with the inlet of the quantitative hydraulic pump. Regulating the displacement of each variable motor can control its output rotation speed. The pressure difference at both ends of variable motor is determined by the driven load. The output pressure of hydraulic pump is equal to the ssum of the pressure differences of all variable motors. Its advantages are low system cost and high system efficiency.
Description
Technical field
The present invention relates to the fluid pressure executive system.
Background technique
Hydraulic Power Transmission System is divided into two big classes: throttling transmission system and volume transmission system.The former responds soon, can carry out advantages such as micrometeor adjusting, but efficient is low, can only be used for low power occasion.Therefore the volume transmission system has the high advantage of efficient, although speed of response is slower, can satisfy most of industrial application requirements, in becoming, the leading role of high power hydraulic transmission system.
Three phases has roughly been experienced in the development of volume transmission system: enclosed volume transmission system, power adaptive system and level pressure network secondary regulation system.
Enclosed volume transmission system does not have restriction loss at main line, and efficient is very high, and passes through the use of slippage pump, safety valve, oil-changing valve, can allow higher revolution speed, and the fuel tank volume is little, is easy to realize overload protection and oily temperature control.But this type systematic is not suitable for single pump multi executors system.
The power adaptive system is controlled by a power pump.Constant pressure by the maintenance load-sensitive valve is that principle is regulated the constant voltage pump delivery, reaches the purpose that the constant current amount is regulated.Not only avoid spill losses, and be applicable to the multi-load operating mode that drives in parallel.But this type systematic still has additional restriction loss at main pipe, and the delivery pressure of pump only adapts with maximum load, and under the operating mode of the bigger load parallel connection of a plurality of variations, efficient significantly reduces.
Level pressure network secondary regulation system is German scholar proposition at the beginning of the eighties, this system is made up of a plurality of variable hydraulic motor and accumulators that are connected in the level pressure network, does not have restriction loss on main line basically, can realize the recovery of braking energy, high energy utilization rate is arranged, and heating seldom.Its structure as shown in Figure 1.But this type systematic requires pump and motor all can realize variable, and cost is higher, and still has current limiting element and controller on the loop, and a spot of restriction loss is arranged.
Summary of the invention
The objective of the invention is to design a kind of hydraulic system with current-constant network and secondary regulation, replace traditional level pressure network secondary regulation hydraulic system, significantly reduce system cost, improve the overall efficiency of hydraulic system.
The technical solution used in the present invention is as follows: it comprises variable displacement motor, the quantitative hydraulic pump of a plurality of band meta bypass overcurrent functions, the inlet port of a plurality of variable displacement motors that have a meta bypass overcurrent function is with after oil drain out is connected successively mutually, the inlet port of its first variable displacement motor is connected with the output terminal P mouth of quantitative hydraulic pump, and the oil drain out of last variable displacement motor is connected with the input end T mouth of quantitative hydraulic pump.
Wherein, the flow of constant-current network is exported by quantitative hydraulic pump, uses for each actuator.Each actuator all adopts the variable displacement motor of band meta bypass overcurrent function, can be by its output speed is controlled in the adjusting of discharge capacity.The inlet port of each variable displacement motor and output terminal and the input end of directly receiving quantitative hydraulic pump after oil drain out is connected mutually.The pressure reduction at each variable hydraulic motor two ends is by the load decision that is driven, and the delivery pressure of oil hydraulic pump then equals each variable displacement motor two ends pressure reduction sum.
The beneficial effect that the present invention has is: because this hydraulic system has been cancelled the current limiting element and the controller of secondary regulating loop in the traditional level pressure network secondary regulation hydraulic system, replaced volume adjustable hydraulic pump and accumulator in the traditional level pressure network secondary regulation hydraulic system with quantitative hydraulic pump, significantly reduce system cost, improve the overall efficiency of hydraulic system, reach optimum energy-saving effect.
Description of drawings
Fig. 1 is traditional level pressure network secondary regulation hydraulic system architecture schematic diagram;
Fig. 2 is a hydraulic system with current-constant network and secondary regulation structure principle chart of the present invention.
Embodiment
As shown in Figure 2, the inlet port of a plurality of variable displacement motors that have a meta bypass overcurrent function is with after oil drain out is connected successively mutually, the inlet port of its first variable displacement motor is connected with the output terminal P mouth of quantitative hydraulic pump 2, and the oil drain out of last variable displacement motor is connected with the input end T mouth of quantitative hydraulic pump 2.
Working procedure: quantitative hydraulic pump is fixed value (as 100l/min) to the flow of constant-current network output, delivery pressure then equal automatically each motor two ends pressure reduction and, can be protected by the built-in safety valve valve of metering pump during overload.
If oil hydraulic motor is not worked, then the stroking mechanism of motor is got back to meta, opens its bypass Restrictor Valves simultaneously, and the flow of metering pump output is all rung off from the bypass Restrictor Valves; If oil hydraulic motor work, then the flow Q by this oil hydraulic motor
iJust equal the fuel supply flow rate of metering pump.The discharge capacity D of governor motor
Mi, just can obtain required rotation speed n
i:
Oil hydraulic motor is into and out of the pressure difference Δ p between the hydraulic fluid port
iBy load torque M
iDecision:
Subscript i in the formula represents i variable displacement motor.The delivery pressure of quantitative hydraulic pump is each oil hydraulic motor pressure differential deltap p
iAnd:
Can get thus, because the overcurrent flow of oil hydraulic motor is a definite value, when required output speed increases, the variables corresponding motor displacement should reduce, brought oil hydraulic motor to increase into and out of the pressure difference between the hydraulic fluid port thus, quantitative hydraulic pump will be exported bigger pressure to guarantee the normal operation of system.
When the load that certain oil hydraulic motor drove need be braked, can be with the reversal of dip of oil hydraulic motor stroking mechanism, variable displacement motor was used as pump and was used under the drive of load this moment, though its overcurrent flow is still determined by the output flow of metering pump, but its outlet pressure is higher than inlet pressure, thereby realized the raising of pressure, supplying with other variable displacement motors uses, realized the recovery of braking energy, increased substantially energy utilization ratio, reduce the heating of braking process, further alleviated the burden of hydraulic power, reach optimum energy-saving effect.
Specific embodiment: in large-scale engineering machineries such as hydraulic shovel, can adopt the quantitative hydraulic pump fuel feeding of one group of big flow, the a plurality of variable displacement motors of tandem drive, realize the driving of its traveller, swirl gear, actuator, dipper mechanism and shovel mechanism respectively, guarantee the harmony of each actuator motions, and reach optimum working efficiency.
Claims (1)
1. hydraulic system with current-constant network and secondary regulation, it is characterized in that: it comprises a plurality of variable displacement motor (1), quantitative hydraulic pumps (2) that have meta bypass overcurrent function, the inlet port of a plurality of variable displacement motors (1) that have a meta bypass overcurrent function is with after oil drain out is connected successively mutually, the inlet port of its first variable displacement motor is connected with the output terminal P mouth of quantitative hydraulic pump (2), and the oil drain out of last variable displacement motor is connected with the input end T mouth of quantitative hydraulic pump (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111753 CN1379186A (en) | 2002-05-17 | 2002-05-17 | Hydraulic system with current-constant network and secondary regulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111753 CN1379186A (en) | 2002-05-17 | 2002-05-17 | Hydraulic system with current-constant network and secondary regulation |
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| Publication Number | Publication Date |
|---|---|
| CN1379186A true CN1379186A (en) | 2002-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02111753 Pending CN1379186A (en) | 2002-05-17 | 2002-05-17 | Hydraulic system with current-constant network and secondary regulation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900192A (en) * | 2010-06-02 | 2010-12-01 | 宁波高新协力机电液有限公司 | Power dividing energy regenerated hydraulic mechanical stepless gearbox for hybrid electric vehicle |
| CN104913048A (en) * | 2015-06-12 | 2015-09-16 | 吉林大学 | Logic control based multi-gear-pump serial multi-gear-motor stepped speed changing system |
| CN106640805A (en) * | 2015-10-30 | 2017-05-10 | 北京精密机电控制设备研究所 | Multiple flow-distribution window structure for aerospace pump-controlled servo system |
-
2002
- 2002-05-17 CN CN 02111753 patent/CN1379186A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900192A (en) * | 2010-06-02 | 2010-12-01 | 宁波高新协力机电液有限公司 | Power dividing energy regenerated hydraulic mechanical stepless gearbox for hybrid electric vehicle |
| CN101900192B (en) * | 2010-06-02 | 2013-06-19 | 宁波高新协力机电液有限公司 | Power dividing energy regenerated hydraulic mechanical stepless gearbox for hybrid electric vehicle |
| CN104913048A (en) * | 2015-06-12 | 2015-09-16 | 吉林大学 | Logic control based multi-gear-pump serial multi-gear-motor stepped speed changing system |
| CN106640805A (en) * | 2015-10-30 | 2017-05-10 | 北京精密机电控制设备研究所 | Multiple flow-distribution window structure for aerospace pump-controlled servo system |
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